EP0816549B1 - Machine à laver domestique comportant un circuit fermé de séchage, un système de condensation de la vapeur et un filtre auto-nettoyant - Google Patents

Machine à laver domestique comportant un circuit fermé de séchage, un système de condensation de la vapeur et un filtre auto-nettoyant Download PDF

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Publication number
EP0816549B1
EP0816549B1 EP97200837A EP97200837A EP0816549B1 EP 0816549 B1 EP0816549 B1 EP 0816549B1 EP 97200837 A EP97200837 A EP 97200837A EP 97200837 A EP97200837 A EP 97200837A EP 0816549 B1 EP0816549 B1 EP 0816549B1
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EP
European Patent Office
Prior art keywords
air
filter
washing
fan
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97200837A
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German (de)
English (en)
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EP0816549A2 (fr
EP0816549A3 (fr
Inventor
Silvano Fumagalli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Candy SpA
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Candy SpA
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Filing date
Publication date
Application filed by Candy SpA filed Critical Candy SpA
Publication of EP0816549A2 publication Critical patent/EP0816549A2/fr
Publication of EP0816549A3 publication Critical patent/EP0816549A3/fr
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Publication of EP0816549B1 publication Critical patent/EP0816549B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements

Definitions

  • the present invention relates to a domestic washing machine incorporating a drying circuit.
  • washer-dryers domestic washing machines, referred to as washer-dryers, which, in addition to washing the laundry, also dry it by means of a current of heated air induced in a closed drying circuit comprising, in sequence, a washing tank-drum unit, an air/water heat exchanger, a suction unit, and a heating unit having electrical resistors.
  • the flow of air induced by the suction unit is heated by the electrical resistors and conveyed into the washing drum where, by passing through the wet laundry, it brings about the evaporation of the absorbed water.
  • the moist air is cooled by a stream of cold water which is taken from the mains and discharged into the back-flow collecting unit. Owing to the cooling effect, the steam condenses and is collected in the washing tank and discharged together with the cooling water.
  • the dehumidified air is then aspirated by the suction unit and recycled.
  • the thermal power used for drying is also completely wasted with the cooling water.
  • Laundry drying machines having the sole function of drying laundry are also known which do not have this disadvantage because the condensation of the steam produced by drying takes place in a condensation circuit having an air/air heat exchanger which uses air from the surroundings to cool the moist air and to condense the steam.
  • the filter inevitably has to be small and therefore it easily becomes blocked in the course of the drying operation, involving substantial losses of pressure in the drying circuit with a consequent increase in the power necessary to obtain a predetermined flow rate, a substantial variation in the flow rate in the course of the drying operation and a reduction in efficiency.
  • the drying circuit may extend, as desired, at levels below and above the level of the loading porthole because it is not intended that the drying drum should be filled with liquid but only that a limited volume of condensation water of the overall order of from 2 to 3 litres at most per drying cycle should be condensed in the drying circuit.
  • DE-A-3728940 discloses a washer-dryer machine substantially according to the preamble of claim 1. However, such a machine is of the top-loading type.
  • the present invention solves this problem and provides a front-loading laundry washer-dryer machine having a drying circuit with an air/air exchanger and a self-cleaning filter for trapping fluff without any necessity for the intervention of the user (such intervention nevertheless always being readily possible).
  • the filter which may have large dimensions and which therefore is hardly subject to blockage and is particularly efficient, is cleaned by a limited amount of a stream of sprinkling water.
  • the washing cycle is advantageously designed to perform the filter-washing operation using all or some of the rinsing water from a washing cycle, or also the water of condensation resulting from the drying operation.
  • a washer-dryer machine comprises a casing 1 of standardised dimensions, for example width 60 cm, depth 50 cm, height 80 cm, which accommodates, in resiliently supported manner, a washing tank 2 containing a rotating drum 3, motor components (not shown), a discharge pump 4 of the self-cleaning type, with its inlet connected to the base of the tank 2 by a flexible tube 5 and with its outlet connected to a discharge pipe 6.
  • the laundry to be washed is loaded into the drum 3 through a front door/porthole 7.
  • the structure of the machine is integrated with a motor fan unit 8 having two separate fans 9, 10, an auxiliary recycling filter/pump unit 11, a heating chamber 12 having heating resistors 29 and ( Figure 2) a sliding filter 13 for trapping the fluff freed during the drying process, and also a cross-flow air/air heat exchanger 14.
  • the filter 13 and the heat exchanger 14 are arranged removably in a flattened box-shaped body 15 arranged at the rear of the machine casing, such as a vertical box which has a small thickness of the order of from 7 to 15 cm and which is closed at the top by a removable cover 16 flush with the top of the machine and which is provided internally with diaphragms 17, 18 and ribs for positioning the filter 13 and the heat exchanger 14 which, together with the diaphragms, form two separate flow paths for the air of the drying circuit and for the air for cooling and condensing the steam.
  • a flattened box-shaped body 15 arranged at the rear of the machine casing, such as a vertical box which has a small thickness of the order of from 7 to 15 cm and which is closed at the top by a removable cover 16 flush with the top of the machine and which is provided internally with diaphragms 17, 18 and ribs for positioning the filter 13 and the heat exchanger 14 which, together with the diaphragms, form two separate
  • the box-shaped body 15 also forms a tank 31 for collecting condensation and a tank 32 for collecting water for washing the filter 13, the first preferably being connected by way of a pipe 33 to the discharge pipe 5, and the second being connected directly to the discharge pump 4 by way of a pipe 34.
  • the tanks 31 and 32 are arranged at a level higher than the maximum filling level of the washing tank 2 in order to avoid back-ups of washing liquid in the course of washing operations.
  • the box 15 is provided with a first air-inlet opening 19 which communicates, by way of a bellows-form resilient pipe 20, with the washing tank 2 and which opens into the tank 32 for collecting the filter-washing water, with a second opening 22 for introducing cooling air into the exchanger 14, which opening 22 is connected by a pipe 23 to the outlet of the fan 10, and with an outlet opening 24 for the drying air from the heat exchanger 14, which opening 24 is connected by a pipe 27 to the inlet of the fan 9.
  • a suction pipe 25 is formed integrally with the box 15 or also separately therefrom and is open to the surrounding atmosphere by way of a grille 26 of the removable covering in order to convey air from the surrounding atmosphere to the inlet of the fan 10.
  • the outlet of the fan 9 conveys the air received through the pipe 27, by means of a bellows-form resilient connection 28, into the heating chamber 12 where heating resistors 29 heat the air stream.
  • the heated air at a temperature of the order of from 120 to 150C, is conveyed by a pipe 30 and introduced, through the opening for loading the drum 3, into the drum itself which it passes through (the drum is expediently perforated) to flow through the bellows-form pipe 20 and the opening 19 into the box 15.
  • the drum 3 which, in the drying stage, is rotated at a suitable speed in order to mix and agitate the laundry placed therein, the current of hot air causes the water absorbed in the laundry to be evaporated.
  • the steam, together with the fluff released from the laundry, is transported by the current of air into the box 15 where it passes through the filter 13 for trapping fluff in order to flow with the air thus filtered into the tank 31 and to pass through the heat exchanger 14 where it partially condenses.
  • the dehumidified air collects in a collector 35 of the heat exchanger 14 and is then aspirated and recycled by the fan 9 through the opening 24 and the pipe 27.
  • the oriented broken line marked by the numeral 36 indicates the path of the drying air.
  • the ambient air necessary to cool and condense the steam contained in the drying air is sucked by the fan 10 through the grille 26 and the pipe 25 and conveyed into the pipe 23. It flows through the opening 22 into the heat exchanger, brushing along radiating fins 37 of the exchanger, is channelled into a space formed between the radiator 14 and the diaphragm 17 and flows into the surrounding atmosphere through a grille 38 in the cover 16.
  • the continuous line 39 with arrows represents the path of the cooling air.
  • the heat exchanger 14 which has the general form of a rectangular parallelepiped is removably arranged in the box-shaped body 15 and can be extracted from the top by means of a handle 40, with simple removal of the cover 16, for easy periodic inspection by the user.
  • the filter 13 which is formed by a fine-meshed net supported by a rectangular frame which is provided, at the top, with a cap/cover with a handle 51, is removably arranged in a sliding manner in the box-shaped body 15 and can be readily removed from the top, with simple removal of the cover 16, for easy periodic inspection by the user and for any cleaning required.
  • means which automatically ensure cleaning, by washing the filter, either at the end of each drying operation or at the end of each washing operation carried out by the machine, especially in the course of a rinsing stage.
  • the filter can be defined as being self-cleaning.
  • the inlet of the pump 11 is connected by way of a pipe 43 to the discharge pipe 5 of the tank 2.
  • a washing operation of a washing machine comprises various stages: washing (optionally preceded by a pre-wash), rinsing and spinning.
  • a rinsing stage consists in filling the tank 2, with clean water taken from the mains, up to a predetermined level (for example level 21), then rotating the drum 3 (optionally intermittently or in alternate directions) for a predetermined period and, finally, actuating the discharge pump in order to empty the tank.
  • a predetermined level for example level 21
  • a substantial proportion of the rinsing water (or of the last lot of rinsing water if more than one rinsing operation) which may even be 50% of the rinsing water, and thus of the order of a few litres, is conveyed to the sprinkler nozzle 41 which sprays the surface of the filter 13 on which the fluff has been deposited, thus causing it to become detached, to fall into the tank 32 and to be transported, with the sprinkling liquid and through the pipe 34, to the pump 4 which expels the liquid and the fluff.
  • the water is discharged continuously, as it is formed, by the pump 4 which is operated continuously or intermittently.
  • the pump 4 can be maintained inactive for almost all of the duration of the drying cycle so that the condensation water accumulates in the tank 2.
  • This accumulation does not prejudice the drying operation because the accumulated water does not fill the tank 2 to a level sufficient to touch the rotating drum 3.
  • the joint actuation of the pump 4 and the pump 11 brings about the expulsion of the condensation water, a substantial proportion of which, of the order of at least one litre, supplies the nozzle 41 for sprinkling and cleaning the filter 13 before being discharged.
  • the joint actuation of the discharge pump 4 and the auxiliary pump 11 is not strictly necessary (the actuation of the pump 4 could follow the actuation of the pump 11) but it is preferable because it enables the fluff trapped by the liquid for washing the filter to be expelled using the pump 4, without liquid or fluff returning to the auxiliary pump 11, which can of course be provided with a filter for trapping fluff but this filter, which is superfluous if the pumps are actuated simultaneously, would require manual cleaning intervention, although this would be easy.
  • the auxiliary pump 11 has the sole function of recycling the condensation or rinsing water to the nozzle 41 and is actuated in conjunction with the discharge pump, it is not absolutely necessary, as already stated, for the pump 11 also to comprise a filter.
  • the pump 11 may be advantageous to use the pump 11 to ensure the recycling of washing water and, optionally, rinsing water to the drum 3 in the course of the respective stages.
  • the nozzle 41 may be supplied directly from the mains, by means of the solenoid valve for charging the machine, which is always present, and a flow-diverter device controlled by the programming components.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Claims (7)

  1. Machine à laver domestique comportant une paroi avant, une paroi arrière et une pompe de vidange (4), du type dans lequel un courant d'air chauffé par des éléments chauffants (29) est induit à travers un tambour de lavage/séchage (3) disposé dans une cuve de lavage (2) par un motoventilateur d'aspiration (8) ayant un premier ventilateur (9) destiné à provoquer l'évaporation du liquide absorbé par le linge placé dans le tambour de lavage, et comprenant un filtre (13) pour filtrer le courant d'air et un échangeur de chaleur air/air (14) muni d'un second ventilateur (10) pour la condensation du liquide évaporé transporté par le courant d'air, caractérisé en ce qu'il comprend :
    une porte de chargement avant (7) disposée dans la paroi avant,
    un corps en forme de boíte (15), muni de diaphragmes internes (17, 18), qui s'ouvre par le haut et est juxtaposé sur la paroi arrière et forme un réservoir collectant la condensation (31) disposé à un niveau supérieur au niveau de remplissage maximum de la cuve de lavage,
    et en ce que
    le second ventilateur (10) est activé par le motoventilateur (8),
    le filtre (13) est monté de façon amovible, avec extraction par le haut, dans le corps en forme de boíte (15), et
    l'échangeur de chaleur air/air (14) est monté de façon amovible, avec extraction par le haut, dans le corps en forme de boíte (15), le corps en forme de boíte formant avec l'échangeur un premier trajet fermé pour le courant d'air, passant par le filtre et l'échangeur, avec un orifice d'entrée (19) s'ouvrant sur la cuve de lavage et un orifice de sortie (24) raccordé à l'entrée du premier ventilateur (9), et un second trajet ouvert destiné à un courant d'air de refroidissement, avec un orifice d'entrée (22) raccordé à la sortie du second ventilateur (10), le premier trajet comprenant ledit réservoir (31) qui collecte le liquide de condensation et qui est relié à un tube (33, 5) destiné à acheminer le liquide de condensation vers la pompe de vidange (4).
  2. Machine à laver selon la revendication 1, comprenant une buse (40) de pulvérisation et de lavage du filtre (13), des moyens (11) pour alimenter la buse avec un courant d'eau, et des moyens (34) pour acheminer l'eau vers la pompe de vidange (4).
  3. Machine à laver selon la revendication 2, dans laquelle les moyens d'alimentation de la buse comprennent une pompe auxiliaire (11) dont l'orifice d'entrée est raccordé à une canalisation de vidange (5) de la cuve de lavage (2) et dont l'orifice de sortie est raccordé à la buse (41).
  4. Machine à laver selon la revendication 3, comprenant des moyens de programmation pour activer la pompe auxiliaire (11) à la fin d'une opération de rinçage et acheminer ainsi au moins une partie de l'eau de rinçage contenue dans la cuve (2) vers le filtre (13), à travers la buse (41).
  5. Machine à laver selon la revendication 3 ou 4, comprenant des moyens de programmation destinés à permettre la récupération du liquide de condensation en provenance de la cuve de lavage (2) au cours d'une opération de séchage, et à activer la pompe auxiliaire (11) à la fin de l'opération de séchage et à acheminer ainsi au moins une partie du liquide de condensation récupéré en provenance de la cuve de lavage (2), vers la buse (41).
  6. Machine à laver selon la revendication 3, 4 ou 5, comprenant des moyens de programmation destinés à activer la pompe de vidange (4) en association avec la pompe auxiliaire (11).
  7. Machine à laver selon la revendication 2, 3, 4, 5 ou 6, comprenant une paire de buses pour effectuer une pulvérisation sur les deux faces opposées du filtre (13).
EP97200837A 1996-06-26 1997-03-20 Machine à laver domestique comportant un circuit fermé de séchage, un système de condensation de la vapeur et un filtre auto-nettoyant Expired - Lifetime EP0816549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI961295 1996-06-26
IT96MI001295A IT1284443B1 (it) 1996-06-26 1996-06-26 Macchina lavatrice di tipo domestico con circuito chiuso di asciugatura, condensazione ad aria del vapore e filtro autopulente

Publications (3)

Publication Number Publication Date
EP0816549A2 EP0816549A2 (fr) 1998-01-07
EP0816549A3 EP0816549A3 (fr) 1998-03-04
EP0816549B1 true EP0816549B1 (fr) 2002-05-02

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EP97200837A Expired - Lifetime EP0816549B1 (fr) 1996-06-26 1997-03-20 Machine à laver domestique comportant un circuit fermé de séchage, un système de condensation de la vapeur et un filtre auto-nettoyant

Country Status (3)

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EP (1) EP0816549B1 (fr)
DE (1) DE69712267T2 (fr)
IT (1) IT1284443B1 (fr)

Cited By (3)

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CN1757814B (zh) * 2004-10-08 2011-02-16 Lg电子株式会社 洗衣机及其控制方法
CN102057099B (zh) * 2008-06-04 2013-03-20 Bsh博世和西门子家用器具有限公司 用于清洁烘干机的热交换器的方法
EP2227584B2 (fr) † 2007-12-20 2015-01-14 BSH Bosch und Siemens Hausgeräte GmbH Appareil de séchage

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EP1719833B1 (fr) 2005-03-14 2008-03-05 Electrolux Home Products Corporation N.V. Sèche-linge domestique avec filtre à peluche correspondant
DE102007016074A1 (de) 2007-04-03 2008-10-09 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Vorrichtung zum Reinigen eines Bauteiles, insbesondere eines Verdampfers einer Kondensatoreinrichtung sowie Wasch- oder Wäschetrockner mit einer solchen Vorrichtung
ITPN20070056A1 (it) * 2007-08-01 2009-02-02 Imat S P A "sistema di pulitura automatico di filtri ad aria e applicazione in una macchina asciugatrice"
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US9828715B2 (en) 2009-05-28 2017-11-28 Lg Electronics Inc. Laundry maching having a drying function
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GB2219652A (en) * 1988-06-10 1989-12-13 Servis Group Limited Water-rinsed lint filter
DE9210477U1 (fr) * 1992-08-05 1992-09-24 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
FR2711073B1 (fr) * 1993-10-15 1995-11-17 Esswein Sa Dispositif de nettoyage pour filtre du circuit séchage par flux d'air chaud d'une machine, en particulier pour une machine lave-linge séchante ou pour un sèche-linge.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1757814B (zh) * 2004-10-08 2011-02-16 Lg电子株式会社 洗衣机及其控制方法
EP2227584B2 (fr) † 2007-12-20 2015-01-14 BSH Bosch und Siemens Hausgeräte GmbH Appareil de séchage
CN102057099B (zh) * 2008-06-04 2013-03-20 Bsh博世和西门子家用器具有限公司 用于清洁烘干机的热交换器的方法

Also Published As

Publication number Publication date
ITMI961295A0 (fr) 1996-06-26
IT1284443B1 (it) 1998-05-21
DE69712267T2 (de) 2002-12-19
DE69712267D1 (de) 2002-06-06
ITMI961295A1 (it) 1997-12-26
EP0816549A2 (fr) 1998-01-07
EP0816549A3 (fr) 1998-03-04

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